Question about Stanley Bostitch BT200K

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Broken plunger on top of piston model sb1850bn

Can it be fixed? and at what price? thank you.

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First I need the exact model number. And to answer the other question yes it can and I will let you know when I have the info I need. What you need to do if you have taken it apart is look at the cylinder and seals for damage. Let me know

Posted on Jan 08, 2009

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1 Answer

Put all new orings in D51845 and worked for a few rounds then piston seized. Any ideas?

New O rings and lubrication ? best is to use a sillicon based lubrication like OKS 1110 or dow corning dc4 the top on and valve above the cilinder is very important to know that the rings and valve are working good flexible and its very ultra clean by this model .
The buffer on the bottom is closed enough to positioned right
pos 9 390159-00 Description: SEALVariant Description: CHECKPieces in Tool: 1List Price: $1.74 this seal is outside the cilinder was that changed to ? pos 1 Close1) 390140-00Description: SEALVariant Description: CYLINDERPieces in Tool: 1List Price: $2.81 is also important

Mar 18, 2016 | Tools & Hardware - Others

1 Answer

Senco 601 plunger sticks when unplugging air line

The piston stop in the head is supposed to grab and hold the piston - I don't believe that is your issue. The problem I think you are experiencing is the head valve not moving freely up and down. There is a funny looking spring under the head valve to push it back - often these get weak or broken causing the head valve to jam.
Part # KB4393
I would purchase the repair kit #YK0360 which includes this spring - clean and lubricate the tool as you reassemble.

Nov 27, 2013 | Senco & Frame Pro 601 Framing Nailer

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Why won't feed plunger advance nails?

The two hex head screws on the very top of the head hold the air deflector and attach to the headvalve (the part inside the head with rubber coating, this headvalve has a gasket under that should be check for proper alignment ). Other small screws that look like set screw are only plugs that are removed to install auto control hoses in factory work. These are only plugs so just put them in a few turns with locktite.

Jan 23, 2013 | Hitachi Tools & Hardware - Others

1 Answer

Porter-cable plunger extended and will not reload new nail

could be a jammed nail in the nose assembly, try removing all the nails and dry firing. If still the same after making sure nothing stuck in the nose, you probably have an issue with the firing valve or piston.

Dec 31, 2011 | Porter Cable Tools & Hardware - Others

1 Answer

My n59fn has huge air leak by the trigger and will not function

I had this problem once and the trigger was defective internally. You should be able to purchase a replacement trigger assembly at the link below.


Cost: $19.99

Hope this helps,

Apr 22, 2010 | Stanley Bostitch BT200K

1 Answer

My finish nailer will not shoot fireing plunger does not go back up when fired

The driver attaches to a piston. If the driver has broken it will not return up it is either broken off the piston or an o-ring has went bad around the cylinder. After firing these o-rings direct a shot of air under the pist so it moves back up. What make of gun do you have?

Nov 17, 2009 | Senco Tools & Hardware - Others

1 Answer

How do I fix the plunger ?

This can be caused by any number of reasons.

If your piston driver does retract and slowly slides back to the downward position. This is a good indication that your piston o-ring is worn and needs replacing.

However the most common cause of the problem in which the driver will not retract at all, is that an o-ring has broken or has popped off of your piston cylinder. This o-ring is located in the bottom chamber of the gun.

Generally if the tool has not had the o-rings replaced in over a year, and if the tool is used quite often, it is good to have all the o-rings replaced especially when they are in contact with moving parts. Also as a rule, if you are unfamiliar with pneumatic tool repair, remove only the parts necessary to your problem. Often one problem can compound to many if you interfere with parts that are working properly.

To make a quick repair take following steps:

Disconnect the tool from air supply.

Remove the head cap from the body by removing the 4 bolts on the top. Be careful not to tear the gasket if you do not have a replacement.

With a thin tool pop the piston driver out of the top, by pushing upwards from the nose end.

If tool has dirt, excess oil, or grit inside clean it up as much as possible especially around rubber o-rings. Keep in mind that the tool needs oil to remain lubricated, don't leave tool dry around o-rings.

Use two head cap screws to gently remove the cylinder plate that is now exposed around the piston cylinder. Gently pull upwards (friction and an o-ring hold this tightly in place).

Now you can remove the piston cylinder. It may pop up because it is spring loaded, or it may be stuck downward. Carefully work it loose so it can be removed.

Examine the o-rings on the cylinder. Are any out of position? If there are any broken they must be replaced. If one popped out of position, reposition it.

The o-ring that can cause this problem is most likely the large rubber ring that covers a series of smaller holes that are positioned around middle portion of the cylinder.

Replace parts in the reverse manner of removal. Lubricate o-rings with appropriate assembly grease which is best, or pneumatic tool oil.

When the cylinder plate is reassembled, make sure that the cylinder is up. In other words, the spring that is surrounding the cylinder below the plate must be released as much as possible. This will enable flush contact between the cylinder and the parts on the head cap when the tool is assembled fully.

Replace the gasket, head cap, and the four bolts.

Hook tool up to air supply, check for air leaks, test fire tool.

Apr 12, 2009 | Hitachi NR83A2 2" To 3 1/4" Full Head...

1 Answer

Driver not moving up to fire position

Dont have your model number but can come up with a few ideas. First the driver blade might be bent, the piston ring/cylinder might be scored or just dry and can't move freely and you could possibly have a nail jammed in the magazine restricting movement. Get back to me with the model number and I will look at a breakdown and see if I can find anything else. Also have you taken the tool apart? Let me know

Jan 21, 2009 | Porter Cable 1" 18 Gauge Brad Nails...

1 Answer

Air allways and continually leaks forcably from the top. Bostitch

This nailgun has several parts to the headvalve that must fit together properly to seal. Go to for a diagram of this tool. The part called the diaphragm is source of problem. It has thin vinyl walls that will fold over when you assemble. The piston will not cause the gun to leak, just make sure that piston fits snug into the cylinder. Loose oring on piston will only cause low power or the poston may not retract all the way back up. Some piston/drivers had a plastic ring instead of an oring. The plastic ring had a secondary oring under, however not necessary. You can use rubber or plastic, just make sure that the piston is not too tight or too loose. The piston oring is the only oring in the gun that can be cut to fit. It is like a piston in a car engine. The piston rings have a gap.

Nov 23, 2008 | Stanley Bostitch 18 Gauge Brad Nailer 1 -...

1 Answer

Hi I have a np80

joe it sounds like you have damaged the return puck inside the cylinder. when the piston bottoms out their is a rubber puck inside that cause recoil.over time it can become hard and no llonger resiliant - when you dry fire it can shatter or crack . if it does not have this then it just needs oil . are you oiling every use? usually 3 drops at start of daywill run them for years. at any rate you will have to do the following to confirm. diconnect air - remove four crews that hold cover or back of cylinder- should be obvious-lift off cover - this will expose back of piston whick is connected to drive pin. you mat have to push it backwards through guide late to eject completely.Inspect cylinder and piston -is it dry? no oil? inspect o rings around piston there will be two one at top and one at bottom. oil with damp oil cloth and reassemble it reverse. take care to twist cylinder to line up drive pin- this is critical.Do this and get back to me. good luck

Oct 22, 2008 | Tools & Hardware - Others

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